Scraper for oil well tubing



' March 7,1939. E, KUE ER 2,149,810

Qfi-RAPER FOR 0ILWELI TUBING Filed Aug. 19, 1935 IIIE.1.-, I 1 1.5-5..

INVENTOR Patented Mar; 7, 1939 UNITED STATES PATENT OFFICE v SORAPER FOB- OIL WELL TUBING Edward A. Kliewer, Longview, Tex., assignor of r one hali to B- W. Fair, Tyler, Tex.

Application August 19, 1935, Serial No. 30348 c (c1; rec-118 This invention relates to-well pumping equipment and it has particular, reference to apparatus and'design to operate ina well tubing assembly to effect removal of deposits oi paramn l in'the walls of the tubing.

The principal objectof the invention is to provide a set of tools designed primarily for operation in the sucker rod assembly, the construction of the toolsbeing such'that the walls of the tubu ing assembly will be scraped clean of paraflinposits.w Accordingly, expensive.equipment is required to remove the deposits of paramn from the walls oi the tubing to enable the new and ll unused cups to'be used therein. Operations of this kind are expensive and require considerable time. The present invention aims therefore among its-most important objects to provide a simple and inexpensive tool or set of 80 tools adapted to be incorporated within the sucker rod assembly in spaced relationship and cooper-- .ates' to scrape the tubing walls of 'paramn deposits when the sucker rod assembly is'vithdrai n from the wells. Withdrawing of the pumpi 1g 8 assembly is required occasionally when the cups have become worn and when withdrawn for any such'purpose, the invention is operative to clean the tubing walls preparatory to introduction of I new cups or' substitute equipment. 4 Q Withthe foregoing-objects as paramount, the

invention has particular reference to its salient Ieatures of construction and arrangement "of parts whichwill become manifest as the.,descrip-' tion proceeds, taken in co'nnection with the ac- U eompanying drawing, wherein:

Figurel is an elevational view of the upper part of theinvention assembly; i. v

Figure 2 is an elevational view of the lower part of the assembly which is spaced well below I the upper part.

Figure 3 is atransverse sectiorron' lines 3-3 on Flgure'l.

Figure 4. is a transverse section on lines l-'-4 onl'lgureil. ll Figure 5 is anelevationalview ot'afiiodified form of the invention wherein the scraper per seis removable from the mounting, and

Figure 6 is a detail view in perspective showin the scraper arranged for threaded securernent to the mandrel or mounting shown in Figure 5. 3

Continuing with a more detailed description of thedra'wing, I designates an elongated piece of material adapted to be incorporated in a sucker rod assembly and whose upper end 2 is enlarged or greater in diameter than its middle section to 10' define a connection for a sucker rod, not shown, and a flattened portion 3 to receive a wrench or the like. The portion 4 of the member below its midway point is enlarged in diameter and is flattened at 8 similar to the flattened portion 3 in '16 the upper portion. These flattened portions are provided to accommodate a wrench or similar tool to effect connection and disconnection of sections of a sucker red, the pins of one section'being threaded into the box lief-the lower end of the tool while thesucker rod I is adapted to be received by the pin H on theupper portion of the tool.

The tool shown inFigure 1 is provided with an annular protuberance or shoulder 5 having a sharpened edge i0,'the latter definingv an annular trough surrounding the cylindrical body I. Communicating with this trough isan angular cleft or channel 9 of greater width at its bottom than at its top. The purpose of this channel, one of which is provided in diametrically opposite relationship in the protuberance 5 will be 7 later explained.'

The companion tool is similar in' design except that two instead of one channel 9 is provided on -,35 either side of the shoulder or protuberance. This toolis likewise arranged in the sucker rod assembly well below the tool just described. It will also be observed that the grooves or channels 9 1 are of greater width-at their lower ends than, at 0 their tops.

In operation, the pumping assembly first includes the pump barrel or traveling valve, thence the tool shown in Figure 2 connected at l2 to the sucker rod assembly and whichordinarily I operates within the lower regions of the well in which a tubing of greater diameter than that nearer the surface is disposed. Next there is provided a string of sucker rods of a predetermined length, thence the tool shown in Figure 1 and another string of sucker rods to. the surface. This explanation defines the assembly so that it will be understood that the tool shown in Figure 2 is known to be well below thecompani'on tool (Fig. 11in the well. In this order the tools are 56 ened edges ID of the members 5 and thus be I scraped therefrom. This paraflin will pass through the grooves or channels 9 of the mem-' bers 5 and since these channels are larger at their lower ends than at their tops, there is little likelihood that the channels will clog and become closed to further passage of paraflin or other matter.

The annular protuberances 5 are of such diameter as to permit of passage of liquid between them and the walls of the tubing, and since such liquid may also pass upwardthrough the channels 9, there will be no difliculties as to construction against .fluid passage around the enlarged portions of the tools.

It is apparent from the foregoing therefore that paraffin is scraped from the walls of the tubing when the tools are withdrawn from the well the sharpened edges l peeling oil the paraffin in the upward travel of the tool while the angular channels 9 permit passage of the paraffin downward for release, the said paraffin and other deposits falling into the bottom of the hole. The walls of the tubing are thus cleaned, permitting new and unused cups to be inserted thereinto for continued operation.

The modified form of the invention shown in Figures and 6 is not materially diflerent from the construction just described and illustrated in Figures 1 to 4 inclusive, except that the anupper portion l4 having a threaded pin thereon and flattened portions l5 to receive a wrench or the like. The lower portion I5 is,of greater diameter necessarily than that of the portion 14 inasmuch as the threads retaining the scraper I'I must be of such diameter that'thescraper can be passed over each protuberance and secured to the threads in the operative position shown in Figure -5, and in which figure the scraper is shown in transverse cross-section.

As .in the structure shown in Figure 1, the scraper is grooved or fluted angularly to permit downward passage of paraifin and other matter as it is dislodged by the scraper.

Manifestly, the construction shown is capable of considerable modification and such modification as is considered within the scope and meaning of the appended claims is also considered within the spirit and intent of the invention.

What is claimed is:

1. A tubing scraper comprising a body having an annular shoulder of greater diameter than the body and tapered at its base, said shoulder being provided with a pair of diametrically opposite, angularly disposed channels terminating at their upper ends in an annular cavity having sharpened edges.

2. A tubing scraper comprising amember having an annular protuberance of slightly less diameter than that of said tubing and provided with an annular cavity having a sharpened edge in close proximity to the walls of said tubing and further having diametrically opposite channels whose edges are angularly disposed with respect to the longitudinal axis of said protuberance.

3. Apparatus for scraping paraffin from well tubing comprising tools in spaced relationship, each having annular shoulders provided with annular cavities at their upper ends having annularly sharpened edges, said shoulders being further provided with diametrically opposed grooves in angular relationship with the longitudinal axis of said toolsand communicating with said cavities.

4. Apparatus for scraping parafiln from the walls of well tubing comprising units arranged for incorporation in the pump rod assembly of said well in spaced relationship, 'each having annularly protruding shoulders provided with annular cavities with sharpened edges surrounding their upper portion in closely spaced relationship with the walls of said tubing, said shoulders further having channels in diametricallyopposed relationship and in angular position with respect to the longitudinal axis of said units.

5. A scraper for well tubing including a member'arranged for suspension in said tubing and having a shoulder defining an annular" cavity provided with a sharpened edge in close proximity to the walls of said tubing and further having grooves for extraneous matter extending at angles with the longitudinal axis of said member.

6. A scraper for well. tubing comprising an elongated member having a shoulder intermediate its ends of slightly less diameter than that of the inside of said tubing and provided with a sharpened upper edge, defining an annular cavity, said shoulder further having passages whose axes are at an angle relative to the axis of said elongated memberand communicating with said cavity, for disposing of matter removed from the tubing walls thereby.

EDWARD A. KLIE'WER. 

